Which of the following finger is having two dorsal interossei muscles:
**Core Concept**
The dorsal interossei muscles are a group of intrinsic muscles of the hand that play a crucial role in finger movement and dexterity. These muscles are responsible for abduction (movement away from the middle finger) of the fingers at the metacarpophalangeal joints.
**Why the Correct Answer is Right**
The middle finger has two dorsal interossei muscles, which are the second dorsal interosseous muscle (2DI) and the fourth dorsal interosseous muscle (4DI). These muscles are located between the metacarpals of the second and fifth fingers and between the metacarpals of the third and fourth fingers, respectively. They work together to facilitate abduction of the fingers, allowing for a wide range of motion and fine motor control. The second dorsal interosseous muscle acts on the index finger, while the fourth dorsal interosseous muscle acts on the ring finger.
**Why Each Wrong Option is Incorrect**
**Option A:** The index finger is acted upon by the second dorsal interosseous muscle, but it does not have two dorsal interossei muscles.
**Option B:** The little finger is acted upon by the third dorsal interosseous muscle, not two dorsal interossei muscles.
**Option D:** The ring finger is acted upon by the fourth dorsal interosseous muscle, but it does not have two dorsal interossei muscles.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the intrinsic muscles of the hand, including the dorsal interossei, are crucial for fine motor control and dexterity. Damage to these muscles can result in significant impairment of hand function, making it essential for surgeons and medical professionals to have a thorough understanding of hand anatomy.
**✓ Correct Answer: C. Middle finger**